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Related Experiment Videos

Piezoelectric-controlled tuning capacitor for surface coils.

J S Hyde1, R J Rilling, A Jesmanowicz

  • 1Department of Radiology, Medical College of Wisconsin, Milwaukee 53226.

Magnetic Resonance in Medicine
|October 1, 1989
PubMed
Summary

A novel piezoelectric-controlled trimmer capacitor was designed for Magnetic Resonance Imaging (MRI) surface coils. This capacitor is crucial for tuning MRI coils, significantly impacting image quality by maintaining resonant frequency coincidence.

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Area of Science:

  • Medical Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Magnetic Resonance Imaging (MRI) surface coils require precise tuning for optimal performance.
  • Traditional tuning methods can be complex and may not adapt to changing conditions.
  • Maintaining resonance between nuclei and the coil is critical for signal detection.

Purpose of the Study:

  • To design and evaluate a piezoelectric-controlled trimmer capacitor for MRI surface coil tuning.
  • To investigate the impact of coil tuning on MRI image quality.
  • To lay the groundwork for an automatic frequency control (AFC) circuit for MRI systems.

Main Methods:

  • Design and fabrication of a piezoelectric-controlled trimmer capacitor.
  • Integration of the capacitor as a tuning element in an MRI surface coil operating at 63.8 MHz.

Related Experiment Videos

  • Assessment of MRI image quality in relation to coil tuning and matching to the transmission line.

    • Main Results:

    • The piezoelectric-controlled trimmer capacitor was successfully designed and implemented.
    • MRI image quality was found to be more sensitive to coil tuning than to the coil-transmission line match.
    • The capacitor demonstrated potential as an active element for frequency stabilization.

    Conclusions:

    • Piezoelectric tuning offers a viable method for optimizing MRI surface coil performance.
    • Precise tuning is a significant factor influencing MRI image quality.
    • The developed capacitor is a key component for future automatic frequency control circuits in MRI.